void EntGhost::think() {
// animate
roto = (roto + 3) % 360;
// scatterDetails
if (--scatterTime <= 0) {
scattering = false;
}
// returning home details
if (homebound) {
if ((homeLocation - getPosition()).length() <= 32) {
homebound = false;
}
}
// if we do not have a map object, bail since the rest of this method relies on it for path finding
if (!map)
return;
// where are we
MapTile current = map->TileFromVect(getPosition());
// are we in a different place since last time?
if (current != lastTile) {
// if we are but we are in a wall (corner case) turn right around and hope for the best
if (!(map->getTile(current) & 1)) {
setOrientation(getOrientation() * quat(0,0,0,1));
} else {
// otherwise plan to wander toward a new tile
// what are our options
MapTile up = current.up();
MapTile left = current.left();
MapTile down = current.down();
MapTile right = current.right();
// where do we want to get to
MapTile targetTile = map->TileFromVect(target);
// find out the distance each option gets us
double updist = (map->VectFromTile(up) - map->VectFromTile(targetTile)).length();
double leftdist = (map->VectFromTile(left) - map->VectFromTile(targetTile)).length();
double downdist = (map->VectFromTile(down) - map->VectFromTile(targetTile)).length();
double rightdist = (map->VectFromTile(right) - map->VectFromTile(targetTile)).length();
// fallback options
MapTile newTarget = current;
double newTargetdist = 0;
// whats the worst case? (we will substitute better options as we find them later
// simple linear search
if ((rightdist >= newTargetdist) && (map->getTile(right) & 1) && (right != lastTile))
newTargetdist = rightdist;
if ((downdist >= newTargetdist) && (map->getTile(down) & 1) && (down != lastTile))
newTargetdist = downdist;
if ((leftdist >= newTargetdist) && (map->getTile(left) & 1) && (left != lastTile))
newTargetdist = leftdist;
if ((updist >= newTargetdist) && (map->getTile(up) & 1) && (up != lastTile))
newTargetdist = updist;
// now do the acctual direction finding (bring us to the best case direction)
// simple linear search
if ((rightdist <= newTargetdist) && (map->getTile(right) & 1) && (right != lastTile)) {
newTarget = right;
newTargetdist = rightdist;
orientation = DIR_RIGHT;
}
if ((downdist <= newTargetdist) && (map->getTile(down) & 1) && (down != lastTile)) {
newTarget = down;
newTargetdist = downdist;
orientation = DIR_DOWN;
}
if ((leftdist <= newTargetdist) && (map->getTile(left) & 1) && (left != lastTile)) {
newTarget = left;
newTargetdist = leftdist;
orientation = DIR_LEFT;
}
if ((updist <= newTargetdist) && (map->getTile(up) & 1) && (up != lastTile)) {
newTarget = up;
newTargetdist = updist;
orientation = DIR_UP;
}
}
// now are are somewhere new
lastTile = current;
}
// acctually move us (speed controlled by scatter state)
setPosition(getPosition() + getOrientation().rotate(vect::FORWARD * (scattering?0.5:2.0)));
}
